Re-added support for restoreAfterError and mtype to editRow

Hello,

I re added support for the restoreAfterError and mtype parameters in the editRow method.
I'm not sure why they were removed in the first place, (see https://github.com/tonytomov/jqGrid/commit/48604395753a5750bcb457a9ca35cd72c3c63794).

Thanks!